Installation steps:

Run SsasEntityFrameworkProviderSetup.msi
and follow the wizard. (This will deploy
documentation, code samples, sample SSAS database backup, local offline
cube file and all needed .NET assemblies into "%ProgramFiles%\Agile Design LLC\SSAS Entity Framework
Provider \" folder and GAC).If you already have NorhtwindEFOlap
sample SSAS database installed on your SQL Server or if you do not need
it, you can skip to Verification step.

If you would like to use SSAS rather than local offline cube file, and your MS SQL
Server is not (local), modify
connection string in "%ProgramFiles%\Agile
Design LLC\SSAS Entity Framework Provider \UsageExample\Sample SSAS
Database\RestoreNorhtwindEFSsasDatabase.cmd". You need
to change yellow
part:

ascmd -i RestoreSsasDB.xmla -S (local)

If you would like to install NorthwindEFOlap sample SSAS database and verify
installation run "%ProgramFiles%\Agile Design LLC\SSAS Entity Framework Provider\UsageExample\Sample SSAS Database\RestoreNorthwindEFSsasDatabase.cmd"
and make sure there are no errors in the output.

Verification:

If you do not have an access to SSAS or you would like to run from local offline cube file, skip to step 3.

If you would like to use SSAS rather than local offline cube file and if your MS SQL Server is not (local),
modify connection string in "%ProgramFiles%\Agile Design LLC\SSAS Entity Framework Provider\UsageExample\Bin\Debug\UsageExample.exe.config" configuration file.
You need to modify a connection string named NorthwindEFOlapOnlineServer:

It is likely that you need to change DataSource part highlighted in yellow (or entire connectionString attribute in some cases) to point it to where your SQL Server is located.
Delete NorthwindEFOlapOfflineCubeFile connection string from UsageExample.exe.config and rename NorthwindEFOlapOnlineServer connection string into NorthwindEFOlapOfflineCubeFile.

Run "%ProgramFiles%\Agile Design LLC\SSAS Entity Framework Provider\UsageExample\Bin\Debug\UsageExample.exe" and make sure it outputs sample MDX query and its results into console.
It should not throw any exceptions.

Now you can reference and use SSAS Entity Framework Provider
assemblies located in "%ProgramFiles%\Agile
Design LLC\SSAS Entity Framework Provider\" folder or in Global
Assembly Cache (GAC).

In order to understand how to use SSAS Entity Framework Provider,
please see source code located in "%ProgramFiles%\Agile
Design LLC\SSAS Entity Framework Provider\UsageExample\" folder, Getting Started
Walkthrough , LINQ/SDX
example and FAQ.